Question

5/x+y -2/x-y =-1, 15/x+y +7/x-y =10.​

Answer 1

Answer:

(5/x+y-2/x-y=-1)*3

15/x+y-6/x-y=-3

subtract equation second from first

-13/x-y=-13

x-y=1

x+y=-1+2/5

x+y=5

x=3,y=2